js setTimeout和setInterval区别和使用
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setTimeout( alert("3秒种过去了"), 3000);//调用一个函数,允许带常量参数
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<script language="Javascript">
//by zuoyang
var x = 1;
var y = 2;
var z = 3;
var sum;
function Plus(a, b)
{
????????? var z = 0;
????????? var i = 0;
????????? for (i = 0; i < arguments.length; i++)
????????? {
?????????????????? z += arguments[i];
????????? }
??? ?? ?? setTimeout( function() {alert(z);}, 6000); //可以带变量参数的setTimeout调用形式
????????? return z;
}
setTimeout( function(){ sum = Plus(x, y, z); }, 3000);/*除了可以带变量参数还可以获取返回值的setTimeout调用形式*/
</script>
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setInterval()的用法和setTimeout()是一样的:
iTimerID = window.setInterval(vCode, iMilliSeconds [, sLanguage])
不同的是setTimeout()是一次性作用,而setInterval()是每隔iMilliSeconds就执行一次vCode.(Evaluates an expression each time a specified number of milliseconds has elapsed)
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