代码如下：
首先实现该功能的js对象LoadingMsg：
代码如下:
var Class = {
create: function() {
return function() { this.init.apply(this,arguments); }
}
}
var LoadingMsg = Class.create();
LoadingMsg.prototype = {
init: function(spanId, spanMsg) {
this.intervalID = -10000;
this.spanId = spanId;
this.spanMsg = spanMsg;
this.timespan = 1000;
this.pointNum = 3;
this.initPointMsg = "...";
},
Loading: function() {
var maxLength = this.spanMsg.length + this.pointNum;
var currentSpanMsg = document.getElementById(this.spanId).innerHTML;
if (currentSpanMsg.length < maxLength) {
document.getElementById(this.spanId).innerHTML += ".";
}
else {
document.getElementById(this.spanId).innerHTML = this.spanMsg;
}
},
Start: function() {
document.getElementById(this.spanId).innerHTML = this.spanMsg + this.initPointMsg;
var callObj = this;
this.intervalID = setInterval(function() { callObj.Loading(); }, this.timespan);
},
End: function() {
document.getElementById(this.spanId).innerHTML = "";
clearInterval(this.intervalID);
}
}
关键点：
如果把
代码如下:
var callObj = this;
this.intervalID = setInterval(function() { callObj.Loading(); }, this.timespan);
写成：
代码如下:
this.intervalID = setInterval(this.Loading, this.timespan);
在执行Loading方法时则会报找不到this.spanMsg的错误。
因为在setInterval里的第一个参数里的this是windows对象，而不是LoadingMsg对象。windows.setInterval嘛。
应用该方法：
代码如下:
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