![js中有["1","2","3","4"]这样一个string，怎么把它变成array](/aiimages/js%E4%B8%AD%E6%9C%89%5B%26quot%3B1%26quot%3B%2C%26quot%3B2%26quot%3B%2C%26quot%3B3%26quot%3B%2C%26quot%3B4%26quot%3B%5D%E8%BF%99%E6%A0%B7%E4%B8%80%E4%B8%AAstring%EF%BC%8C%E6%80%8E%E4%B9%88%E6%8A%8A%E5%AE%83%E5%8F%98%E6%88%90array.png)
代码如下：
window.onload = function () {
document.getElementsByTagName('a')[0].onclick = function (ev) {
alert('我被单击了')
ev.preventDefault()//w3c规范，如火狐、chrome等
//event.returnValue = false//ie下，不过ie8、可以用上面的那个
alert('我被阻止了')
}
}
Ajax, xmlURL为你要执行的url.var xmlHttp
if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Microsoft.xmlHTTP")
}
else if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Msxml2.xmlHTTP.4.0")
}
else if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Msxml2.xmlHTTP")
}
else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest()
}else{
alert("You browser security setting not allow to create XMLHTTPP object.")
}
xmlHttp.open("get", xmlURL, false)
xmlHttp.send(null)
