html页面：

 {
    field: ‘suppliersLevel‘,
    align: ‘center‘,
    title: ‘供应商级别‘,


    formatter:function(value, row, index){

        if(value==0){
            return value;
        }else{
            var  keepOne = jsHelp.keepOneContainZero(value);
            return  jsHelp.keepOneContainZero(value);
        }


    }
}
js页面中

keepOneContainZero: function (num) {
    var result = parseFloat(num);//把他转换成Float类型
    if (isNaN(result)) {//判断result结果是否为nan
        result = 0;//如果是把他变成0
    }
    result = Math.round(num * 10) / 10;//round函数：四舍五入 例如：5.867*10=58.67 ，58.7/10=5.87-->5.9
    var s_x = result.toString();    //把result转换成tostring;
    var pos_decimal = s_x.indexOf(‘.‘);//indexOf截取‘.‘后面的数
    if (pos_decimal < 0) {
        pos_decimal = s_x.length;
        s_x += ‘.‘;
    }

    while (s_x.length <= pos_decimal + 1) {
        s_x += ‘0‘;
    }
    return s_x;
},


//add by litan 20200420
//四舍五入保留2位小数（不够位数，则用0替补）
keepTwoContainZero: function (num) {
    var result = parseFloat(num);
    if (isNaN(result)) {
        result = 0;
    }
    result = Math.round(num * 100) / 100;
    var s_x = result.toString();
    var pos_decimal = s_x.indexOf(‘.‘);
    if (pos_decimal < 0) {
        pos_decimal = s_x.length;
        s_x += ‘.‘;
    }
    while (s_x.length <= pos_decimal + 2) {
        s_x += ‘0‘;
    }
    return s_x;
},

IDEA中HTML页面的数据的值，四舍五入保留一位小数或者保留两位小数