![\"\"](\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/08\/\u6307\u94881-1.png\")
<\/div><\/p>\n\u200b \u5982\u679c\u628a\u5185\u5b58\u5355\u5143\u6bd4\u55bb\u4e3a\u5c0f\u67dc\u5b50\uff0c\u90a3\u4e48\u5185\u5355\u5143\u7684\u5730\u5740\u5c31\u76f8\u5f53\u4e8e\u67dc\u5b50\u7684\u7f16\u53f7\uff0c\u5982\u4e0b\u6240\u793a<\/p>\n
![\"\"](\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/08\/\u5185\u5b58\u5355\u5143-2.jpg\")
<\/div><\/p>\n\u200b \u5730\u5740\uff08Address\uff09\u662f\u7528\u6765\u5e2e\u6211\u4eec\u627e\u5230\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u7684\u6570\u636e\u7684\uff0c\u6bcf\u4e2a\u5730\u5740\u90fd\u6307\u5411\u4e00\u5757\u5b58\u50a8\u7a7a\u95f4\uff0c\u53ef\u4ee5\u8bf4\u201c\u6307\u5411\u201d\u4e8c\u5b57\u5f88\u597d\u5730\u8868\u8fbe\u51fa\u4e86\u5730\u5740\u7684\u7cbe\u9ad3\uff0c\u4e3a\u4e86\u80fd\u591f\u66f4\u597d\u5730\u53cd\u6620\u51fa\u5730\u5740\u7684\u7cbe\u9ad3\uff0c\u5728\u9ad8\u7ea7\u8bed\u8a00\u4e2d\u5730\u5740\u4e5f\u88ab\u5f62\u8c61\u5730\u79f0\u4e3a\uff1a\u6307\u9488\uff08Pointer\uff09<\/p>\n
![\"\"](\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/08\/\u6307\u94882-1.png\")
<\/div><\/p>\n1.2 \u5982\u4f55\u83b7\u53d6\u6307\u9488<\/h3>\n
\u200b \u6307\u9488\u5c31\u662f\u5730\u5740\uff0c\u83b7\u53d6\u6307\u9488\u5c31\u662f\u83b7\u53d6\u5730\u5740\uff0c\u83b7\u53d6\u53d8\u91cf\u7684\u6307\u9488\u5c31\u662f\u83b7\u53d6\u53d8\u91cf\u7684\u5730\u5740\uff08\u9996\u5730\u5740\uff09\u3002<\/p>\n
\u200b \u5bf9\u4e8e\u4e00\u4e2a\u53d8\u91cf<\/p>\n
var x int = 100<\/code><\/pre>\n\u200b \u6211\u4eec\u53ef\u4ee5\u7528&\u7b26\u62ff\u5230\u53d8\u91cf\u7684\u5730\u5740\uff0c\u6216\u8005\u8bf4\u62ff\u5230\u4e86\u4e00\u4e2a\u6307\u5411\u53d8\u91cf\u7684\u6307\u9488<\/p>\n
fmt.Println(&x) \/\/ 0xc000016070\n\nx=200 \/\/ \u53d8\u91cf\u76f8\u5f53\u4e8e\u4e00\u4e2a\u5bb9\u5668\uff0c\u4e3a\u53d8\u91cf\u586b\u5145\u4e00\u4e2a\u65b0\u503c\uff0c\u5bb9\u5668\u7684\u5730\u5740\u4e0d\u53d8\nfmt.Println(&x) \/\/ 0xc000016070<\/code><\/pre>\n1.3 \u901a\u8fc7\u6307\u9488\u53ef\u4ee5\u64cd\u4f5c\u53d8\u91cf\u503c<\/h3>\n
\u200b \u82e5\u60f3\u901a\u8fc7\u6307\u9488\u800c\u975e\u53d8\u91cf\u540d\u53bb\u8bbf\u95ee\u53d8\u91cf\uff0c\u9700\u8981\u5728\u6307\u9488\u524d\u52a0*\u53f7\uff0c\u5982\u4e0b<\/p>\n
fmt.Println(*(&x)) \/\/ 100<\/code><\/pre>\n\u200b \u6beb\u65e0\u7591\u95ee\uff0c\u6211\u4eec\u901a\u8fc7\u6307\u9488\u4e0e\u53d8\u91cf\u540d\u64cd\u4f5c\u7684\u90fd\u662f\u540c\u4e00\u5730\u5740\u7684\u6570\u636e<\/p>\n
\/\/ \u901a\u8fc7\u53d8\u91cf\u540d\u4fee\u6539\u503c\nx=200\nfmt.Println(*(&x)) \/\/ 200\nfmt.Println(x) \/\/ 200\n\n\/\/ \u901a\u8fc7\u53d8\u91cf\u7684\u6307\u9488\u4fee\u6539\u503c\n*(&x)=300\nfmt.Println(*(&x)) \/\/ 300\nfmt.Println(x) \/\/ 300 <\/code><\/pre>\n1.4 \u6307\u9488\u7684\u7c7b\u578b<\/h3>\n
\u200b \u5176\u5b9e\uff0c\u6307\u9488\u662f\u6709\u7c7b\u578b\u7684\uff0c<\/p>\n
var x int = 100\nvar y string = "hello"\n\nfmt.Printf("%T",&x) \/\/ \u8f93\u51fa\u7c7b\u578b\uff1a*int\nfmt.Printf("%T",&y) \/\/ \u8f93\u51fa\u7c7b\u578b\uff1a*string<\/code><\/pre>\n\u200b \u4f46\u4ee4\u4eba\u7591\u60d1\u7684\u662f\uff1a\u6307\u9488\u5c31\u662f\u5730\u5740\uff0c\u5730\u5740\u4e0d\u5c31\u662f\u4e00\u4e32\u5341\u516d\u8fdb\u5236\u8868\u793a\u7684\u6570\u5b57\u4e48(\u5176\u5b9e\u5e95\u5c42\u90fd\u662f\u4e8c\u8fdb\u5236)\uff0c\u54ea\u6765\u7684\u4ec0\u4e48\u7c7b\u578b\u4e00\u8bf4\u5462\uff1f<\/p>\n
\u9996\u5148\u9700\u77e5\uff1a\u53d8\u91cf\u540d\u6307\u5411\u7684\u53d8\u91cf\u5730\u5740\u662f\u53d8\u91cf\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u9996\u4e2a\u5b57\u8282\u5355\u5143\u7684\u5730\u5740\uff0c\u8bbf\u95ee\u53d8\u91cf\u65f6\uff0c\u9700\u8981\u901a\u8fc7\u53d8\u91cf\u540d\u6307\u5b9a\u7684\u9996\u5730\u5740\uff0c\u7136\u540e\u4f9d\u636e\u7c7b\u578b\u89c4\u5b9a\u7684\u5927\u5c0f\uff0c\u8bfb\u53d6\u540e\u7eed\u5185\u5bb9\u3002\n\n\u200b\u7136\u540e\uff1a\u53d8\u91cf\u7684\u6307\u9488\u4e0e\u53d8\u91cf\u540d\u4e00\u6837\uff0c\u90fd\u662f\u6307\u5411\u9996\u5730\u5740\u7684\uff0c\u6240\u4ee5\u6307\u9488\u4e5f\u5fc5\u987b\u6709\u7c7b\u578b\uff0c\u624d\u80fd\u5728\u53d6\u5230\u9996\u5730\u5740\u540e\u6839\u636e\u7c7b\u578b\u7684\u5927\u5c0f\u89c4\u5b9a\u53d6\u51fa\u540e\u7eed\u7684\u5185\u5bb9<\/code><\/pre>\n![\"\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/p>\n1.5 \u6307\u9488\u53d8\u91cf<\/h3>\n
\u200b \u6211\u4eec\u53ef\u4ee5\u5c06\u6307\u9488\/\u5730\u5740\u4fdd\u5b58\u5230\u4e00\u4e2a\u53d8\u91cf\u4e2d\uff0c\u8fd9\u4e2a\u53d8\u91cf\u79f0\u4e4b\u4e3a\u6307\u9488\u53d8\u91cf\uff0c\u6307\u9488\u53d8\u91cf\u91cc\u5b58\u653e\u7684\u662f\u53e6\u5916\u4e00\u4e2a\u53d8\u91cf\u7684\u5730\u5740<\/p>\n
var x int = 100 \nvar p *int = &x \n\n\/\/ \u6709\u4e86\u6307\u9488\u53d8\u91cfp\uff0c*p\u5c31\u662f*(&x)\uff0c\u5373*(\u53d8\u91cfx\u7684\u5730\u5740)\uff0c\u64cd\u4f5c\u5c06\u4f1a\u66f4\u52a0\u6e05\u6670\nfmt.Println(p) \/\/ p\u7684\u503c\u4e3a\u53d8\u91cfx\u7684\u5730\u5740\uff1a0xc000016070\nfmt.Println(*p) \/\/ *p\u5373*(&x)\uff0c\u7ed3\u679c\u4e3a\uff1a100\nfmt.Println(&p) \/\/ \u53d8\u91cfp\u672c\u8eab\u4e5f\u80af\u5b9a\u662f\u6709\u5730\u5740\u7684\uff1a0xc00000e030<\/code><\/pre>\n<\/div><\/p>\n\u200b \u4e00\u53e5\u8bdd\uff1a\u6307\u9488\u5c31\u662f\u5730\u5740, \u6307\u9488\u53d8\u91cf\u5c31\u662f\u5b58\u50a8\u5730\u5740\u7684\u53d8\u91cf\uff0c\u53d8\u91cf\u540dx\u4e0e*p\u64cd\u4f5c\u7684\u90fd\u662f\u540c\u4e00\u4e2a\u7a7a\u95f4<\/p>\n
x = 200\nfmt.Println("x: ", x) \/\/ 200\nfmt.Println("*p: ", *p) \/\/ 200\n\n\/\/*p=300\u7b49\u540c\u4e8ex=300\n*p = 300\nfmt.Println("x: ", x) \/\/ 300\nfmt.Println("*p: ", *p) \/\/ 300\n\n\/\/ ps: \n\u53d8\u91cf\u540dx\u79f0\u4e4b\u4e3a\u76f4\u63a5\u5f15\u7528\n*p\u79f0\u4e4b\u4e3a\u95f4\u63a5\u5f15\u7528\u6216\u89e3\u5f15\u7528\uff1a*p\u662f\u901a\u8fc7\u501f\u52a9\u53d8\u91cfx\u7684\u5730\u5740\u6765\u95f4\u63a5\u64cd\u4f5c\u53d8\u91cf\u7684\u7a7a\u95f4\u7684<\/code><\/pre>\n\u4e8c \u6307\u9488\u7684\u5e94\u7528<\/h2>\n2.1 \u50a8\u5907\u77e5\u8bc6\uff1a\u6808\u5e27\u7684\u5185\u5b58\u5e03\u5c40<\/h3>\n
\u200b \u7a0b\u5e8f\u7684\u5185\u5b58\u5e03\u5c40\u56fe\u5982\u4e0b
\n
<\/div><\/p>\n\/\/ \u4e86\u89e3\u5373\u53ef\n\u4ee3\u7801\u533a.text\uff1a\u5b58\u653eCPU\u6267\u884c\u7684\u673a\u5668\u6307\u4ee4\uff0c\u4ee3\u7801\u533a\u662f\u53ef\u5171\u4eab\uff0c\u5e76\u4e14\u662f\u53ea\u8bfb\u7684\u3002\n\n\u6570\u636e\u533a.rodata\u4e0e.data\uff1a\u5b58\u653e\u5df2\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u3001\u9759\u6001\u53d8\u91cf\uff08\u5168\u5c40\u548c\u5c40\u90e8\uff09\u3001\u5e38\u91cf\u6570\u636e\u3002\n\n.bss\u533a\uff1a\u5b58\u653e\u7684\u662f\u672a\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\u3002\n\n\u5806\u533a\uff1a\u5806\u662f\u7531malloc()\u51fd\u6570\u5206\u914d\u7684\u5185\u5b58\u5757\uff0c\u5411\u4e0a\u589e\u957f\u3002\u4f7f\u7528free()\u51fd\u6570\u6765\u91ca\u653e\u5185\u5b58\uff0c\u5806\u7684\u7533\u8bf7\u91ca\u653e\u5de5\u4f5c\u7531\u7a0b\u5e8f\u5458\u63a7\u5236\uff0c\u5bb9\u6613\u4ea7\u751f\u5185\u5b58\u6cc4\u6f0f\n\n\u6808\u533a\uff1a\u9996\u5148\u5728\u7f16\u8bd1\u65f6\u7531\u7f16\u8bd1\u5668\u81ea\u52a8\u5206\u914d\u91ca\u653e\u597d\uff0c\u7136\u540e\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\uff0c\u6808\u533a\u7531\u64cd\u4f5c\u7cfb\u7edf\u81ea\u52a8\u7ba1\u7406\uff0c\u65e0\u987b\u7a0b\u5e8f\u5458\u624b\u52a8\u7ba1\u7406\u3002\u5b58\u653e\u51fd\u6570\u7684\u53c2\u6570\u503c\u3001\u8fd4\u56de\u503c\u548c\u5c40\u90e8\u53d8\u91cf\u3002\uff0c\u5411\u4e0b\u589e\u957f<\/code><\/pre>\n\u6211\u4eec\u7684\u9700\u8981\u5173\u6ce8\u7684\u662f\u7528\u6237\u533a\uff0c\u9488\u5bf9\u5982\u4e0b\u4ee3\u7801<\/p>\n
package main\n\nimport "fmt"\n\nfunc main() {\n var x int = 100\n var p *int = &x\n\n x = 200\n fmt.Println("x: ", x) \/\/ 200\n fmt.Println("*p: ", *p) \/\/ 200\n\n \/\/*p=300\u7b49\u540c\u4e8ex=300\n *p = 300\n fmt.Println("x: ", x) \/\/ 300\n fmt.Println("*p: ", *p) \/\/ 300\n}<\/code><\/pre>\n\u4e0a\u8ff0\u4ee3\u7801\u90fd\u5b58\u50a8\u5728\u7528\u6237\u533a\u7684stack(\u6808)\u533a<\/strong>. \u4e00\u822cgo\u7a0b\u5e8f\u8c03\u7528 make()<\/code> \u6216\u8005 new()<\/code>\u51fa\u6765\u7684\u90fd\u5b58\u50a8\u5728\u7528\u6237\u533a\u7684heap(\u5806)\u533a<\/strong><\/p>\n\u63a5\u4e0b\u6765, \u6211\u4eec\u6765\u4e86\u89e3\u4e00\u4e2a\u65b0\u7684\u6982\u5ff5: \u6808\u5e27<\/strong>.<\/p>\n\u6808\u5e27: \u7528\u6765\u7ed9\u51fd\u6570<\/strong>\u8fd0\u884c\u63d0\u4f9b\u5185\u5b58\u7a7a\u95f4, \u53d6\u5185\u5b58\u4e8estack(\u6808)\u533a<\/strong>\u4e0a.<\/p>\n\u5f53\u51fd\u6570\u8c03\u7528\u65f6, \u4ea7\u751f\u6808\u5e27; \u51fd\u6570\u8c03\u7528\u7ed3\u675f, \u91ca\u653e\u6808\u5e27.<\/strong><\/p>\n\u90a3\u4e48\u6808\u5e27\u7528\u6765\u5b58\u653e\u4ec0\u4e48?<\/p>\n
\n- \u5c40\u90e8\u53d8\u91cf<\/strong><\/li>\n
- \u5f62\u53c2<\/strong><\/li>\n
- \u5185\u5b58\u5b57\u6bb5\u63cf\u8ff0\u503c<\/li>\n<\/ul>\n
\u5176\u4e2d, \u5f62\u53c2\u4e0e\u5c40\u90e8\u53d8\u91cf\u5b58\u50a8\u5730\u4f4d\u7b49\u540c<\/strong><\/p>\n\u5f53\u6211\u4eec\u7684\u7a0b\u5e8f\u8fd0\u884c\u65f6, \u9996\u5148\u8fd0\u884c main()<\/code>, \u8fd9\u65f6\u5c31\u4ea7\u751f\u4e86\u4e00\u4e2a\u6808\u5e27.<\/p>\n\u5f53\u8fd0\u884c\u5230 var x int = 100<\/code> \u65f6, \u5c31\u4f1a\u5728\u6808\u5e27\u91cc\u9762\u4ea7\u751f\u4e00\u4e2a\u7a7a\u95f4.<\/p>\n\u540c\u7406, \u8fd0\u884c\u5230 var p *int = &x<\/code> \u65f6\u4e5f\u4f1a\u5728\u6808\u5e27\u91cc\u4ea7\u751f\u4e00\u4e2a\u7a7a\u95f4.<\/p>\n\u5982\u4e0b\u56fe\u6240\u793a<\/p>\n
<\/div><\/p>\n\u6211\u4eec\u589e\u52a0\u4e00\u4e2a\u51fd\u6570, \u518d\u6765\u7814\u7a76\u4e00\u4e0b.<\/p>\n
package main\n\nimport "fmt"\n\nfunc foo(m int){\n var n int = 555\n n += m\n}\n\nfunc main() {\n var x int = 100\n var p *int = &x\n\n x = 200\n fmt.Println("x: ", x) \/\/ 200\n fmt.Println("*p: ", *p) \/\/ 200\n\n \/\/*p=300\u7b49\u540c\u4e8ex=300\n *p = 300\n fmt.Println("x: ", x) \/\/ 300\n fmt.Println("*p: ", *p) \/\/ 300\n\n foo(111)\n}<\/code><\/pre>\n\u5982\u4e0b\u56fe\u6240\u793a, \u5f53\u8fd0\u884c\u5230 foo(111)<\/code> \u65f6, \u4f1a\u7ee7\u7eed\u4ea7\u751f\u4e00\u4e2a\u6808\u5e27, \u8fd9\u65f6 main()<\/code> \u4ea7\u751f\u7684\u6808\u5e27\u8fd8\u6ca1\u6709\u7ed3\u675f.<\/p>\n<\/div><\/p>\n\u5f53 foo(111)<\/code> \u8fd0\u884c\u5b8c\u6bd5\u65f6, \u5c31\u4f1a\u91ca\u653e\u6389\u8fd9\u4e2a\u6808\u5e27.<\/p>\n<\/div><\/p>\n2.2 \u5185\u7f6e\u51fd\u6570new(T)<\/h3>\n
\u91ce\u6307\u9488\uff1a\u521d\u59cb\u503c\u4e3a\u65e0\u6548\u7684\u5185\u5b58\u5730\u5740<\/strong><\/p>\nvar p *int = 0xc000016080 \/\/ \u8be5\u5185\u5b58\u5730\u5740\u4e0d\u6307\u5411\u4efb\u4f55\u7a7a\u95f4\uff0c\u65e0\u6548<\/code><\/pre>\n\u7a7a\u6307\u9488\uff1a\u521d\u59cb\u503c\u4e3anil\u7684\u6307\u9488<\/strong><\/p>\n\u6211\u4eec\u53ef\u4ee5\u7701\u7565\u521d\u59cb\u5316\u8868\u8fbe\u5f0f\uff0c\u4f7f\u7528\u96f6\u503c\u521d\u59cb\u5316\u673a\u5236\u58f0\u660e\u4e00\u4e2a\u6307\u9488\u53d8\u91cf\u3002\u6ce8\u610f\uff1a\u4efb\u4f55\u7c7b\u578b\u7684\u6307\u9488\u7684\u96f6\u503c\u90fd\u662fnil<\/p>\n
var p *int \/\/ \u6ce8\u610f*int\u4e0d\u662fint\uff0c*int\u7684\u521d\u59cb\u5316\u96f6\u503c\u4e3anil\n\nfmt.Println(p) \/\/ <nil><\/code><\/pre>\n\u6b64\u65f6\uff0cp\u7684\u521d\u59cb\u503c\u4e3a<\/p>\n<\/div><\/p>\n\u6211\u4eec\u662f\u65e0\u6cd5\u8fdb\u884c\u5982\u4e0b\u8d4b\u503c\u7684<\/p>\n
*p = 200 \/\/ \u5373*nil=200 ,*\u540e\u8ddf\u7684\u5e94\u8be5\u662f\u4e00\u4e2a\u5730\u5740\uff0c\u800cnil\u4e0d\u662f\u4e00\u4e2a\u5730\u5740\uff0c<\/code><\/pre>\n\u6211\u4eec\u5f53\u7136\u53ef\u4ee5\u5728\u58f0\u660e\u597d\u6307\u9488\u53d8\u91cfp\u540e\uff0c\u4e3a\u5176\u8d4b\u503c\u4e00\u4e2a\u5730\u5740\uff0c\u7136\u540e\u518d\u8fdb\u884c\u4e0a\u8ff0\u8d4b\u503c\u64cd\u4f5c<\/p>\n
\/\/ \u5148\u58f0\u660e\u4e00\u4e2a\u53d8\u91cf\uff0c\u7ed1\u5b9a\u4e00\u4e2a\u53d8\u540dx\nvar x int = 100 \n\n\/\/ \u7136\u540e\u624d\u80fd\u901a\u8fc7&x\u83b7\u53d6\u4e0a\u8ff0\u53d8\u91cf\u7684\u5730\u5740\uff0c\u8d4b\u503c\u7ed9\u6211\u4eec\u58f0\u660e\u597d\u7684\u6307\u9488\u53d8\u91cfp\np = &x\n\n\/\/ \u53ef\u4ee5\u6b63\u5e38\u6267\u884c\u4e0b\u8ff0\u8d4b\u503c\u64cd\u4f5c\u5566\n*p = 200 \/\/ \u5373*(&x) = 100<\/code><\/pre>\n\u4f46\u4f60\u4eec\u53d1\u73b0\u6211\u4eec\u59cb\u7ec8\u90fd\u7ed5\u4e0d\u8fc7\u4e00\u4e2a\u53d8\u91cf\u540dx\uff0c\u5982\u679c\u6211\u4eec\u60f3\u4e0d\u4f9d\u8d56\u4e8e\u53d8\u91cfx\uff0c\u76f4\u63a5\u58f0\u660e\u4e00\u4e2a\u521d\u59cb\u7684\u96f6\u503c\u4e0d\u4e3anil\u7684\u6307\u9488\uff0c\u90a3\u4e48\u6307\u9488\u53d8\u91cf\u7684\u58f0\u660e\u8bed\u53e5\u5c31\u4e0d\u80fd\u7701\u7565\u521d\u59cb\u5316\u8868\u8fbe\u5f0f\u4e86\uff0c\u5fc5\u987b\u4f7f\u7528\u5185\u7f6e\u51fd\u6570new(T)\u4f5c\u4e3a\u521d\u59cb\u5316\u8868\u8fbe\u5f0f<\/p>\n
\/\/ \u521d\u59cb\u5316\u8868\u8fbe\u5f0fnew(T)\u5c06\u521b\u5efa\u4e00\u4e2aT\u7c7b\u578b\u7684\u533f\u540d\u53d8\u91cf\uff0c\u521d\u59cb\u5316\u4e3aT\u7c7b\u578b\u7684\u96f6\u503c\uff0c\u7136\u540e\u8fd4\u56de\u53d8\u91cf\u5730\u5740\uff0c\u8fd4\u56de\u7684\u6307\u9488\u7c7b\u578b\u4e3a*T\u3002\np:=new(int) \/\/ \u6b64\u65f6\u6307\u9488p\u4fbf\u4e0d\u518d\u662f\u7a7a\u6307\u9488\u6216\u91ce\u6307\u9488\n\n\/\/ \u4e0a\u8ff0\u8bed\u53e5\u76f8\u5f53\u4e8e\u6267\u884c\u4e86\u4e0b\u9762\u4e24\u6b65\u4f2a\u4ee3\u7801\nvar _ int \/\/ \u5148\u521b\u5efa\u4e00\u4e2a\u533f\u540d\u53d8\u91cf\np:=&_ \/\/ \u533f\u540d\u53d8\u91cf\u4e0d\u53ef\u7528\uff0c\u6b64\u5904\u4e3a\u4f2a\u4ee3\u7801<\/code><\/pre>\n<\/div><\/p>\n\u200b \u6b64\u65f6new()\u5f97\u5230\u7684\u6307\u9488\u53d8\u91cfp\u5c31\u53ef\u4ee5\u8d4b\u503c\u5566<\/p>\n
*p = 200 \/\/ \u6539\u52a8\u7684\u662f\u533f\u540d\u53d8\u91cf\u7684\u503c<\/code><\/pre>\n2.3 \u53d8\u91cf\u7684\u751f\u547d\u5468\u671f<\/h3>\n
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