擴充一個字元自動長度自動檢測的函數

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/** * 擴充一個字元自動長度自動檢測的函數 * @param  {[type]}   max      [description] * @param  {Function} callback [description] * @return {[type]}            [description] */jQuery.fn.maxLength = function(max, callback) {this.each(function(){var type = this.tagName.toLowerCase();var inputType = this.type ? this.type.toLowerCase() : null;if(type == "input" && inputType == "text" || inputType == "password") {this.maxLength = max;} else if(type == "textarea") {this.onkeypress = function(e) {var obj = e || event;var keyCode = obj.keyCode;var hasSelection = document.selection ? document.selection.createRange().text.length > 0 : this.selectionStart != this.selectionEnd;return !(this.value.length >= max &&(keyCode > 50 || keyCode == 32 || keyCode == 0 || keyCode == 13) && !obj.ctrlKey && !obj.altKey && !hasSelection);};this.onkeyup = function() {if(‘undefined‘ != typeof(callback)) {callback(this.value.length);}if(this.value.length > max) {this.value = this.value.substring(0,max);}};}});};

　　

擴充一個字元自動長度自動檢測的函數