JavaScript Tutorial:JavaScript Function Closures JavaScript Reference:JavaScript function Statement Browser Support returnis an ECMAScript1 (JavaScript 1997) feature. It is supported in all browsers: ChromeEdgeFirefoxSafariOperaIE YesYesYesYesYesYes
If you getUncaught SyntaxError: Illegal return statementin your JavaScript console, it’s usually because you accidentally put areturnstatement (return) outside of a function. This is not allowed: // This throws an error because it’s outside of a functionreturn"David" This is allowed: // ...
请参阅有关闭包的文章。 js functionmagic(){returnfunctioncalc(x){returnx*42;};}constanswer=magic();answer(1337);// 56154 规范 Specification ECMAScript® 2026 Language Specification #sec-return-statement 浏览器兼容性 参见 函数 闭包 Ad
代码语言:javascript 复制 return; a + b; 控制台会警告“unreachable code after return statement”。 从Gecko 40 (Firefox 40 / Thunderbird 40 / SeaMonkey 2.37)开始,如果在一个 return 语句后发现无法访问的代码,控制台将会显示一个警告。 示例 返回 下面的函数返回它的参数的平方x,其中x是一个数字。 代...
Functions Closures 文件標籤與貢獻者 標籤: JavaScript Statement 此頁面的貢獻者:fscholz,TylerH,Wingpad,GilDawson,arai,Delapouite,Havvy,arkapravamajumder,Sheppy,trevorh,Mgjbot,Maian,Marcoos,Dria 最近更新:fscholz,Nov 4, 2015, 2:26:34 PM
代码语言:javascript 复制 struct s{double i;}f(void);// function returning struct sunion{struct{int f1;struct s f2;}u1;struct{struct s f3;int f4;}u2;}g;struct sf(void){returng.u1.f2;}intmain(void){// g.u2.f3 = g.u1.f2; // undefined behavior (overlap in assignment)g.u2.f3=...
执行结果Uncaught SyntaxError: Illegal return statement(…) 意思是非法捕获的查询返回语句。 当执行return语句时,即使函数主体中还有其他语句,函数执行也会停止! if (username==""){ alert("请输入用户名"); returnfalse; } if(qq==""){ alert("请...
Javascript错误提示--SyntaxError: Illegal return statement SyntaxError: Illegal return statement错误 'use strict' for (var i=0; i<9; i++){ document.write(i+""); //return ; }; document.write(i*i); 查看了js的手册后发现,在js中return 语句只能放在function中,如果不是在一个function中弹出如...
Because the return operator immediately ends a function, you can use it to skip the else in an if...else statement.// returns true if the number is bigger than 10 // This is how you would write it with if...else var isItBiggerThanTen = function (num) { if (num > 10) { ...
return语句只能出现在函数体内，出现在代码中的其他任何地⽅造成语法错误！for(var i = 1; i < 10; i++) { if(i == 8) { return;} console.log(i);alert(i);document.write(i);} 执⾏结果Uncaught SyntaxError: illegal return statement(...)错误意思是⾮法捕获的查询返回语句。