function callAnotherFunc(fnFunction, vArgument) { fnFunction(vArgument); } var doAdd = new Function("iNum", "alert(iNum + 10)"); callAnotherFunc(doAdd, 10);//输出 "20" 在上面的例子中,callAnotherFunc() 有两个参数 - 要调用的函数和传递给该函数的参数。这段代码把 doAdd() 传递给 cal...
A callback is a function passed as an argument to another function This technique allows a function to call another function A callback function can run after another function has finished Function Sequence JavaScript functions are executed in the sequence they are called. Not in the sequence they...
如果在字符串上下文中使用 caller 属性,那么结果和 functionName.toString 一样,也就是说,显示的是函数的反编译文本。 01functionCallLevel(){ 02if(CallLevel.caller == null) { 03alert("CallLevel was called from the top level."); 04}else{ 05alert("CallLevel was called by another function:\n"+...
> (function () { return 'abc' }()) 'abc' 如果省略括号,您将得到语法错误,因为 JavaScript 看到一个函数声明,它不能是匿名的: > function () { return 'abc' }() SyntaxError: function statement requires a name 如果添加名称,您也会得到语法错误,因为函数声明不能立即调用: > function foo() { re...
A callback is a function that is passed as an argument to another function and is executedafter its parent function has completed. 以上是Google的解释,非常清晰简明,小编令人窒息的四级英语水平都能看懂。 下面给一个回调的例子 function doSomething(msg, callback){//callback只是一个参数名而已,可以叫...
A callback is a function that is passed as an argument to another function and is executed after its parent function has completed. 以上是Google的解释,非常清晰简明,小编令人窒息的四级英语水平都能看懂。 下面给一个回调的例子 functiondoSomething(msg,callback){alert(msg);if(typeofcallback=="functi...
myFunction(y>=0?y:-y) 复制 最后,无论 JavaScript 在哪里期望一个语句,你也可以使用一个表达式;例如: foo(7,1); 复制 整行是一个语句(所谓的表达式语句),但函数调用foo(7, 1)是一个表达式。 分号 在JavaScript 中,分号是可选的。但是,我建议始终包括它们,因为否则 JavaScript 可能会错误猜测语句的结束...
functionPoint(x,y){'use strict';this.x=x;this.y=y;} Due to strict mode, you get a warning when you accidentally forgetnewand call it as a function: > var pt = Point(3, 1); TypeError: Cannot set property 'x' of undefined ...
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function callSomeFunction(someFunction, someArgument){ return someFunction(someArgument); } 这个函数接受两个参数。第一个参数应该是一个函数,第二个参数应该是要传递给该函数的一个值。然后,就可以像下面的例子一样传递函数了。 function add10(num){ ...