Statement 1 在循环开始之前设置变量 (var i=0)。 Statement 2 定义循环运行的条件(i 必须小于 5)。 Statement 3 在每次代码块已被执行后增加一个值 (i++)。 2、for/in循环 for/in 语句循环遍历对象的属性: var person={fname:"Bill",lname:"Gates",age:56}; var txt = “”; for (x in perso...
js中for循环中用break报错Uncaught SyntaxError: Illegal break statement? hxy 1819 发布于 2022-08-19 天津 let arr=document.getElementsByClassName("img"); let arr1=document.getElementsByClassName("index2") var len=0; var along=arr.length; function g() { if(len==along){len=0;}{ for(let i...
Statement 1 在循环开始之前设置变量 (var i=0)。 Statement 2 定义循环运行的条件(i 必须小于 5)。 Statement 3 在每次代码块已被执行后增加一个值 (i++)。 语句1 通常我们会使用语句 1 初始化循环中所用的变量 (var i=0)。 语句1 是可选的,也就是说不使用语句 1 也可以。 您可以在语句 1 中初...
JavaScriptBreak and Continue Thebreakstatement "jumps out" of a loop. Thecontinuestatement "jumps over" one iteration in the loop. The Break Statement You have already seen thebreakstatement used in an earlier chapter of this tutorial. It was used to "jump out" of aswitch()statement. ...
因为你没搞清楚「表达式」 expression 与「语句」 statement 的区别。条件运算符 a ? b : c 的后两部分必须是可用来赋值的表达式,而 break 是语句,所以你那样写是非法的。就好象你不能写 a = break b = return 一个道理。 基本功没过关,需恶补。 编辑于 2013-07-03 10:41 1 以军空袭叙利亚军事基地...
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。
JavaScript Objects HTML DOM Objects JavaScript Break and Continue« Previous Next Chapter » The break statement "jumps out" of a loop.The continue statement "jumps over" one iteration in the loop.The Break StatementYou have already seen the break statement used in an earlier chapter of this...
JavaScript Labels As you have already seen, in the chapter about the switch statement, JavaScript statements can be labeled. To label JavaScript statements you precede the statements with a colon: label: statements The break and the continue statements are the only JavaScript statements that can "...
Jump Statement in Javascript Keep boostraps modal stay open after postback from code behind. Keep element in same position when zooming in or out how? Keep html elements on the same line - CSS keep the menu in its current state after loading page Keypress event for textbox asp.net ...
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...