Calls a method of an object, substituting another object for the current object.call([thisObj[, arg1[, arg2[, [, argN]]]]])Arguments thisObj Optional. The object to be used as the current object.arg1, arg2, , argN Optional. List of arguments to be passed to the method.Res The call method is used to call a method on behalf of another object. The call method allows you to change the object context of a function from the original context to the new object specified by thisObj.If thisObj is not supplied, the global object is used as thisObj.
<script language="JavaScript"> <!-- function add(a,b) { return a+b; } function sub(a,b) { return a-b; } var x=sub.call(add,3,1);//相当于sub(add.arguments[0],add.arguments[1]);即用sub方法代替了当前的add方法，并把add方法中的实参赋sub方法的形参。 alert("sub.call(add,3,1)="+x); //--> </script>
<script language="JavaScript"> <!-- function add(a,b) { return a+b; } function sub(a,b) { return a-b; } var x=sub.call(add,3,1);//相当于sub(add.arguments[0],add.arguments[1]);即用sub方法代替了当前的add方法，并把add方法中的实参赋sub方法的形参。 alert("sub.call(add,3,1)="+x); //--> </script> var x=sub.call(add,3,1); 输出2就相当于var x=sub（3,1);//
<script language=javascript>
function test()
{
alert("haha")
}
test.call(null,null)
//就相当于test()
</script>
第一个参数是对象，第二个以后的是参数
比如
abc.call(gg,a,b,c)
就相等于
gg.abc(a,b,c)
thisObj
Optional. The object to be used as the current object.arg1, arg2, , argN
Optional. List of arguments to be passed to the method.Res
The call method is used to call a method on behalf of another object. The call method allows you to change the object context of a function from the original context to the new object specified by thisObj.If thisObj is not supplied, the global object is used as thisObj.
<!--
function add(a,b)
{
return a+b;
}
function sub(a,b)
{
return a-b;
}
var x=sub.call(add,3,1);//相当于sub(add.arguments[0],add.arguments[1]);即用sub方法代替了当前的add方法，并把add方法中的实参赋sub方法的形参。
alert("sub.call(add,3,1)="+x);
//-->
</script>
<!--
function add(a,b)
{
return a+b;
}
function sub(a,b)
{
return a-b;
}
var x=sub.call(add,3,1);//相当于sub(add.arguments[0],add.arguments[1]);即用sub方法代替了当前的add方法，并把add方法中的实参赋sub方法的形参。
alert("sub.call(add,3,1)="+x);
//-->
</script>
var x=sub.call(add,3,1);
输出2就相当于var x=sub（3,1);//