js 限制两位浮点数

clearNoNum(form,val,text){

//修复第一个字符是小数点 的情况.

    if (this[form][val][text] !='' &&this[form][val][text].substr(0,1) =='.') {

this[form][val][text] ="";

}

this[form][val][text] =this[form][val][text].replace(/^0*(0\.|[1-9])/,'$1');//解决 粘贴不生效

    this[form][val][text] =this[form][val][text].replace(/[^-\d.]/g,"");//清除“数字”和“.”以外的字符

    this[form][val][text] =this[form][val][text].replace(/\.{2,}/g,".");//只保留第一个. 清除多余的

    this[form][val][text] =this[form][val][text].replace(".","$#$").replace(/\./g,"").replace("$#$",".");

this[form][val][text] =this[form][val][text].replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3');//只能输入两个小数

    if (this[form][val][text].indexOf(".") <0 &&this[form][val][text] !="") {//以上已经过滤，此处控制的是如果没有小数点，首位不能为类似于 01、02的金额

        if (this[form][val][text].substr(0,1) =='0' &&this[form][val][text].length ==2) {

this[form][val][text] =this[form][val][text].substr(1,this[form][val][text].length);

}

}

},