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/**

 * 正则表达式对象;

 * @type {{onlyNum: RegExp, passW: RegExp, chinaFont: RegExp, phoneNum: RegExp, cardNu: RegExp, emailExg: RegExp}}

 */

var regExp = {

    onlyNum: /[0-9]+$/,

    passW: /^[0-9a-zA-Z]{6,16}$/,

    chinaFont: /^[a-zA-Z\u4E00-\u9FA5]{2,10}$/,

    phoneNum:/^1[3|4|5|7|8][0-9]\d{4,8}$/,

    cardNu:/(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/,

    emailExg: /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/

};

/**

 * 进行验证和值的返回 函数体;

 * @param v

 * @param s

 * @returns {*}

 */

var information = function(v,s){

    var m = null;

    switch (s){

        case "pass":

            m = regExp.passW;break;

        case "onnu":

            m = regExp.onlyNum;break;

        case "cfon":

            m = regExp.chinaFont;break;

        case "phon":

            m = regExp.phoneNum;break;

        case "idca":

            m = regExp.cardNu;break;

        case "emal":

            m = regExp.emailExg;break;

    }

    return (m.test(v))?(true):(false);

};

/************对验证的结果给予提示*************/

function TipFun(x){

    var $this = this.nextElementSibling;

    this.onfocus = function(){

        $this.className = "";

        $this.innerHTML = "";

    };

    if(x === true){

        $this.innerHTML ="";

        $this.className = "icon icon-ok-sign";

        $this.style.color = "green";

    }else{

        $this.className = "";

        $this.innerHTML = ‘<div style="position: absolute;left: 20px;top: 0; padding: 5px 5px;width: 100px;min-height: 30px;background-color: #fff;box-shadow: 0 0 5px #ccc;font-size: 14px;line-height: 1.4;color: #ccc;">您的输入存在不符合要求的字符，请您重新输入！</div>‘;

        this.value = "";

    }

}

不断重复

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原文地址：http://my.oschina.net/530520/blog/507447