/**
 * 限制只能輸入number
 * @param  {[type]} dom [限制的dom類名]
 */
function checkNumer(dom) {
        if (typeof $ == 'function') {
            let inp = $(dom);
            /**
             * 校驗的正則
             * @param  {[type]} cdom [當前dom]
             */
            function viviNum(cdom) {
                let curvalue = '',
                    firststr = '';
                curvalue = $(cdom)[0].localName == 'input' ? cdom.value : cdom.innerText;
                curvalue = curvalue.toString();
                if (curvalue[0] == '-') {
                    firststr = '-';
                }
                let curindex = curvalue.indexOf('.');
                let curzero = curvalue.indexOf('0');
                if (curzero == 0) { //第一位是0
                    if (curvalue.length > 1) {
                        if (curvalue[curzero + 1] != '.') {
                            curvalue = '';
                        }
                    }
                }
                if (curindex >= 0) {
                    if (curindex == 0) {
                        let firstr = curvalue.substring(0, curindex + 1);
                        let newstr = curvalue.substring(curindex + 1);
                        firststr=firstr;
                        curvalue = newstr.replace(/\./g, '');   
                    } else {
                        if(curindex == 1&&curvalue[0]=='-'){
                            // curvalue=curvalue.split(".").join("");
                            curvalue='0.';
                        }
                        let firstr = curvalue.substring(0, curindex + 1);
                        let newstr = curvalue.substring(curindex + 1);
                        if (newstr.indexOf('.') >= 0) {
                            curvalue = firstr + newstr.substring(0, newstr.indexOf('.'));
                        } else {
                            curvalue = firstr + newstr;
                        }
                    }
                }
                if ($(cdom)[0].localName != 'input') {
                    cdom.innerText = (firststr=='.'?(0+firststr):firststr) + curvalue.replace(/[^\d\.]/g, '');
                } else { //input
                    cdom.value = (firststr=='.'?(0+firststr):firststr) + curvalue.replace(/[^\d\.]/g, '');
                }
            }
            inp.on({
                keyup: function() {
                    viviNum(this);
                },
                blur: function() {
                    viviNum(this);
                }
            });
        }
    }
//呼叫
checkNumer('.pt_teaching_box_right input');