扩展JavaScript的String对象方法:

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1. replaceAll方法

String.prototype.replaceAll = function(regStr, replaceStr) {
	var reg = new RegExp(regStr, "gm");
	return this.replace(reg, replaceStr);
}

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2. trim方法

String.prototype.trim = function() {
	var reg = /^\s+(.*?)\s+$/;
	return this.replace(reg, "$1");
}

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