js onkeyup replace automatic replacement method

This article introducesjs onkeyup replace automatic replacement method

function checkFloatNum(obj)
{
    //先把非数字的都替换掉，除了数字和.
    obj.value = obj.value.replace(/[^\d.]/g,"");
    //必须保证第一个为数字而不是.
    obj.value = obj.value.replace(/^\./g,"");
    //保证只有出现一个.而没有多个.
    obj.value = obj.value.replace(/\.{2,}/g,".");
    //保证.只出现一次，而不能出现两次以上
    obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");
}

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