执行方式如下：
$("input").change(function() {var config = {imgWrapWidth: 300, //pximgWrapHeight: 200, //pximgMaxWidth: "100%",imgMaxHeight: "100%",};ImgShow(this, "result", config);});
函数：
function ImgShow(arg, showWrapId, config) {//input的状态change的时候,执行此函数,需要把input用this的方式传递进来，三个参数必须有//arg=this showWrapId=图片显示框的ID config=显示框的大小和图片显示的大小//图片在显示框中绝对居中//config = {//imgWrapWidth: 300, //px//imgWrapHeight: 200, //px//imgMaxWidth: "100%",//imgMaxHeight: "100%",//};var file = arg.files[0];if(!/image\/\w+/.test(file.type)) {alert("请上传图片！");} else {var reader = new FileReader();//将文件以Data URL形式读入页面 reader.readAsDataURL(file);reader.onload = function(e) {var showWrap = document.getElementById(showWrapId);showWrap.style.width = config.imgWrapWidth + "px";showWrap.style.height = config.imgWrapHeight + "px";showWrap.style.textAlign = "center";//显示文件 showWrap.innerHTML = "<span style='vertical-align: middle;display: inline-block;height: 100%;'></span>" +"<img style='vertical-align: middle;display: inline-block;max-width:" + config.imgMaxWidth + ";max-height:" + config.imgMaxHeight + ";'" +" src='" + this.result + "' alt='' />";}}
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