<input class="name" id="name" type="text" placeholder="请输入" οnkeyup="checkLength(this, 8);" />
var checkLength = function(dom, maxLength){var l = 0;for(var i=0; i<dom.value.length; i++) {if (/[\u4e00-\u9fa5]/.test(dom.value[i])) {l+=2;} else {l++;}if (l > maxLength) {dom.value = dom.value.substr(0,i);alert('字数超出范围![1,4]');break;}}};
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