版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_21423689/article/details/83507223
/**
* 限制只能输入number
* @param {[type]} dom [限制的dom类名]
*/
function checkNumer(dom) {
if (typeof $ == 'function') {
let inp = $(dom);
/**
* 校验的正则
* @param {[type]} cdom [当前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);
}
});
}
}
//调用
checkNumer('.pt_teaching_box_right input');