angular，使用directive实现，将input的数字保留两位小数，不足两位补0.

https://www.oschina.net/code/snippet_929096_53265

angular.module('app').directive('numFormat',function() {
return {
scope:{
model : '=ngModel'
},
link: function(scope, elm, attrs, ctrl) {

function format(){
if(isNaN(scope.model) || scope.model == ""){
scope.model = "0.00";
}else{
//最多保留两位小数
var f = parseFloat(scope.model);
var f = Math.round(scope.model*100)/100;
var s = f.toString();
var rs = s.indexOf('.');
if(rs < 0){
s = s + ".00";
}else{
while(s.length <= rs + 2){s += '0';}
}
scope.model = s;
}
}
format();//初始化
$(elm).bind("blur",format);//jq方式绑定事件
}
};
});