验证是否输入

JS

window.onload = function(){
	var _isContent = document.getElementById("isContent"),
			_strs = document.getElementById("strs");

	_isContent.onclick = function(){
		if(!_strs.value.replace( /^(\s|\u00A0)+|(\s|\u00A0)+$/g, "" )){
			alert("您的输入为空！");
		}else{
			alert("您的输入不为空！");
		}
	}
};