Howt to delay code execute when using dwr ajx in javascript
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阻止界面提前渲染
解压dwr.jar，可以发现里面有engine.js,有这么一个方法
DWREngine.setAsync = function(async) { DWREngine._async = async;};这个_async默认值为true.啥意思呢？ 它表示程序可以异步执行，在ajax请求，回调，数据处理的过程中，其后面的代码也可以执行。
如果需要同步执行的话，就可以在执行的代码段前面，加DWREngine.setAsync(false); //同步化
当ajax代码段结束后，加加DWREngine.setAsync(true); //恢复默认，异步执行方式
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